*{
  margin: 0;
  padding: 0;
}
body{
  display: flex;
  flex-direction: column;
}
body > section{
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  justify-content: center;
  padding: 20px;
  width: 100vw;
  background-color: #ddd;
}
.box-color{
  width: 600px;
  height: 600px;
  margin: 20px ;
}